As discussed in [1]}, the iterative process in (REF ) converges to the optimal solution for any initial power vector \({\mathbf {q}}_{\text{s}} \succeq {\mathbf {0}}\)  if function \({\mathbf {\Lambda }} ({\mathbf {q}}_{\text{s}})\)  is standard. Moreover, the sufficient condition for \({\mathbf {\Lambda }} ({\mathbf {q}}_{\text{s}})\)  to be standard is that \({\mathbf {\Delta }}({\mathbf {q}}_{\text{s}})\)  is standard. Therefore, we only need to prove that \({\mathbf {\Delta }}({\mathbf {q}}_{\text{s}})\)  is standard. Since the elements in \({\mathbf {F}}\)  are nonnegative, \({\mathbf {q}}_{\text{s}} \succeq {\mathbf {0}}\)  and \({\mathbf {\theta }} \succ {\mathbf {0}}\) , we have
